Some clarification is needed on the Aqueduct during C&K: OK, So I have upgraded my city to have an Aqueduct, so now I get to take a resource of my choice whenever a production is rolled and I don't produce anything.

Q1) What if I would have produced something, but there weren't enough resource cards to satisfy everyone so no one got that resource on that roll. Do I get to use the Aqueduct and take a resource of my choice?

Q2) While combining C&K with Traders and Barbarians I am using the Fishermen of Catan. On a roll I produce fish, but no resources. Do I get to use the Aqueduct and take a resource of my choice?

Wow, those are excellent questions. I love the aqueduct so I'm surprised I haven't run into those situations.

Q1) I don't think there is an official ruling on this, but I would say if everyone else doesn't get a resource, then you don't either. The aqueduct should be less powerful than owning a city/settlement on a tile that you want resources from.

Q2) Again, never read an official ruling on this question, but there does seem to be a consensus about this among the players. The German edition of the rules clearly differentiates fish as being separate from resources, while the English translation is ambiguous. So, most people play that if you have an aqueduct and get fish, but no resources from a roll, then you still get to choose one free resource.